Jeweler s tool chuck aitd handle



yA. F. Rosms. JEWELER'S TOOL CHUCK AND HANDLE.

APPLICATION FILED IAN25| i918- A PatentedJune 10, 1919.

lat,

@awwtoz al if' bbzh ALBERT F. ROBBINS, OF WALTHAIVI, MASSACHUSETTS.

JEWELERS TOOL CHUCK AND HANDLE.

Speccaton of Letters Patent.

Patented June 10, 1919.

Application :filed January 25, 1918. Serial No. 213,723.

T0 all whom t mayooncem:

Be it known that I, ALBERT F. RoBBiNs, a citizen of the United States residing at VValtham, in the county ofMiddlesex and State of Massachusetts, have invented certain new and useful Improvements in Jewelers Tool Chucks and Handles; and I do declare the following to be a full, clear, and exact description of the invention,` such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide a simple, inexpensive and efficient tool handle and chuck for jewelers drills and the like, which may be employed for holding drills and other tools of various sizes; and with this object in view, the invention resides in the novel construction herein described and claimed and shown in the accompanying drawing wherein;

Figure 1 is a side elevation;

Fig. 2 is a longitudinal section;

Fig. 3 is a transverse section on the plane of the line 3-3 of Fig. 2;

Fig. 4 is an end elevation looking in the direction of the arrows 4--4 of Fig. 2;

Fig. 5 is a perspective view of one of the tool holders;

Fig. 6 is a transverse section on line 6-6 of Fig. 5; and

Fig. 7 is a sectional view of one of the jaw contracting caps.

In the drawing above briefly described, the numeral 1 designates a straight elongated handle preferably of cylindrical shape with reduced threaded ends 2, the greater part of said handle being suitably roughened to insure a firm grip in the hand. Each end of the handle 1 is formed with a longitudinal bore 3 of either uniform or different diameters and as shown, these bores may be connected by a smaller bore 4.

In each bore 3 is an elongatedv cylindrical tool holder 5 having conical ends 6, the two halves of said holders being formed with longitudinal bores 7 of different diameters to receive different sized drills and the like. A suitable number of longitudinal slits 8 lead from the intermediate portion of each holder 5 through the ends thereof to form a plurality of tool gripping vaws or fingers 9 at each end of the holder. These jaws may be contracted around the tools by caps 10 whose closed outer ends are formed with openings 11 partly receiving the conical outer ends 6 of the holders. The slits 8 at one end of the holder 5 are staggered with respect to those at the other end to form yielding necks connecting the two sets of gaws.

No two bores 7 are of the same diameter and it will thus be seen that by removing the caps 10 and reversing the holders 5, a bore of any required size may be positioned for use, thereby adapting the device to all of le usual diEerent sizes of drills and the From the foregoing and the accompanying illustration, it will be seen that although my invention is of simple and inexpensive nature, it will be highly efiicient and desirable. The exact construction shown has proven very eective and is preferably employed, but within the scope of the invention as claimed, numerous minor changes may well be made.

I claim:

A jewelers tool chuck comprising an elongated handle having a central bore of uniform diameter throughout its length, said bore opening at one end through the front end of the handle and terminating at its other end in a flat bottom within said handle, a one-piece tubular tool holder received in said bore and of uniform diameter throughout its length with the exception of its ends, said ends being conical, the bore of said tool holder being of diferent diameter at one end than at the other end to receive tools of different size, said holder having longitudinal slits leading from its center through its ends and dividing said holder into two sets of jaws, the slits of one end of the holder being staggered with respect to those of the other end to form yielding necks connecting the two sets of jaws, and a tubular cap threaded on the end of said handle and having in its outer end an opening for receiving either conical end of the aforesaid holder to contract the jaws of such end upon the tool, the other jaws then resting squarely against said bottom of the handle bore.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ALBERT F. ROBBINS.

Witnesses:

BENJ. F. THORNBUEG, JOHN F. LIGHT.

Copies of this patent may 'be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

